I played maaany characters from KHR in my past so fear not, I am very familiar with how Mukuro's mist flames work!
It could be interesting, because Illidan may at least be able to tie Mukuro's illusions to him, like it would have a unique look of mist flames to it possibly? He may not be able to see THROUGH the illusion or see it properly at first (illusions that are more sound/smell focused would probably be more effective on him than ones mostly based on sight). I'm up for Mukuro finagling some bullshit on Illidan, even if it takes some adjusting.
His possession abilities he'd see through though, it's basically one of the reasons why he got the eyes in the first place (he can see demons possessing or assuming humanoid form).
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It could be interesting, because Illidan may at least be able to tie Mukuro's illusions to him, like it would have a unique look of mist flames to it possibly? He may not be able to see THROUGH the illusion or see it properly at first (illusions that are more sound/smell focused would probably be more effective on him than ones mostly based on sight). I'm up for Mukuro finagling some bullshit on Illidan, even if it takes some adjusting.
His possession abilities he'd see through though, it's basically one of the reasons why he got the eyes in the first place (he can see demons possessing or assuming humanoid form).